As title says but no guesses please someone who has looked at both maps.

 

You mean the updated standard rom?

Believe changes to the High rpm to shut the drivebywire Throttle to stop it slamming into the limiter and alteratons to the knock control settings so it works better.

Simon

 

Roms yes thats what I meant, Geat, I wondered if they altered fuel maps, increased fuel decresed boost etc. This is great. Thanks for that. You wouldnt happen to know if the ECU can operate duel maps. IE one for modified and one for when the cat goes back on at MOT Time?

 

The fuel maps are unchanged updated versus original
The timing maps are unchanged

The only changes were the requested torque settings for towards the top end which effectively paper over the issues IMO by setting an even lower soft limiter.

They have still had engine failures even on the revised map.

Knock control strategy is not changed from what I could see comparing the two (3 if you include the early release of the hatch map) roms.

 

That can be done although not true duel maps.
Will be further enhanced by the release of ecuteks racerom too

Simon

 

just compared files and there are (very minor) changes to the fuel maps

 

The latest factory version ROM is richer in the midrange, I have had reported increases in fuel consumption of 3-5mpg, which is not good.

Andy

 

Its a difficult subject to mention over the forum because there are people whose engines have failed. But as a new owner of an early 08 I want to build my own opinion of why and to obviously take preventitive measures. The warranty will be out soon although the car has only done 20K miles and I first planned to stage one/two the car via Andy F. Simply because he is in Scotland and comes highly recommended.

Ive rebuilt a couple of engines (not Subaru), the last one being the most involved and I also used an aftermarket ECU (Haltek), this was a serious learning curve. I wont go down that road again for a road car. So I dont want to rebuild this engine, or pay someone else to do so as the car cost a fortune and should be fit for purpose.
I believe that despite the piston design changes from Hawkeye to Hatch reported on here, that they alone arent the cause. Detonation is the killer and the victim is the piston thus getting the blame or partial blame. I also believe that Forged or not Dett will kill your engine just as quickly if maps allow it. Yes theres no proof of that because theres no forged piston rebuild thats blown but that will be because each forged rebuild has probably been remapped.
So long as the mixture is correct, ron is right, heatsoak and oil vapour is minimum and the engine isnt given high revs for prolonged periods it should last and that goes for any car, Thats my opinion. So no exhaust or filter or dump valves will be fitted to my car until ECU remapping time because all of those change the air intake and breathing, which is already lean due to emission control.

Thanks Duncan for that info, its good to get any info from people who are working with/on the parts in question. Thanks too Simon, dual maps would be handy, I will look into this. Andy, when you say the "latest" factory rom do you mean the latest as in newest 2010 hatch or latest Rom for the early 08 cars?

 

I think at least part of the issue is the rev limit is too low on the hatch ... too easy to bounce into it.

I think part of the reason no mapped hatches seem to have had issues is that the remap gives so much more grunt in the midrange that it encourages the owner to change gear earlier to bring it back into the torque band rather than sailing straight into the limiter hoping to extract every ounce of power from it.

.... I wouldnt rule out actual issues with the underlying code in the ecu though as some strange things can happen within these.

 

Interesting about the rev limit, whats the power map from a Dyno look like, wheres the peak in both torque and power? Usually the peak is quite a bit before the limiter and there is little to be gained thereafter. Ive adjusted the shift light and buzzer down by 500rpm from default.
I take it each setting (I), (S) and (S#) all have the same amout of maps albeit relative to each settings performance?

 

The only different maps as far as I can see are the drive by wire requested torque tables between the various settings on the ****. Fueling, boost, wastegate control, cams and ignition etc are shared tables. Admittedly the boost control is driven by the requested torque but that justtakes it to a different part of the map, not a separate map.

I have not had a 100% std one on a dyno yet but I would guess peak power is around 6000 rpm and peak torque around 4400 rpm. It doesnt leave a lot beyond the peak power point before you are hitting the already low very hard limiter. On the revised map, the limiter was softened from what I can see and effectively lowered.